<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #content{color: red;}
    </style>
</head>
<body>
    <!-- <h1>chrome-plugin-test</h1> -->
    <p id="content"></p>
    <script src="popup.js"></script>
</body>
</html>